the

In a sentence

• The klavír ukládali do muzea.

  They were putting the piano in the museum.

  In this sentence, the word 'the' is used to specify a singular, definite object ('the piano') that is already known in the conversation or context.

• Přečetl jsem the knihu, kterou mi doporučili.

  I read the book that they recommended to me.

  Here, 'the' marks 'book' as a definite entity, known because of the following descriptor that the book being referred to was recommended.

• The dům na rohu je můj oblíbený.

  The house on the corner is my favorite.

  In this case, 'the' specifies 'house,' indicating it is unique within its spatial descriptor and known to the listener.